How to Export Excel to PDF in .NET (Fast & Accurate Method)

If you’ve ever tried exporting Excel to PDF in a backend service, you probably started with Microsoft.Office.Interop.Excel . And then it broke. No Office is installed on the server. Random crashes under load. Processes that refuse to die. It might work on your machine — but not in production. What you really want is something predictable: no Office dependency, no layout surprises, and something that actually survives in a server or container environment. So how do you do that cleanly in .NET? Why Traditional Approaches Fall Short The go-to options for Excel-to-PDF conversion in .NET each come with real trade-offs. Microsoft.Office.Interop.Excel requires a full Office installation on the server — something Microsoft explicitly advises against for server-side use. Even when it works, it's single-threaded COM automation running in a multi-request environment: slow, fragile, and prone to leaving zombie processes when something goes wrong. Manual rendering with libraries like iTextSharp fli